muttered one of the men in a disappointed tone.
"No, I guess they both got away," agreed another. "We scared 'em off, anyway."
"Did they steal anything?"
"No. They didn't have time. I nailed the first one before he'd been on the ship long. I guess he just went on ahead to see if everything was clear."
"Aw, I'm goin' to bed. As long as we scared 'm off—"
The voices died away.
Relieved, Joe swam on. In a few minutes he caught sight of a dark shape ahead. It was the motorboat.
Silently, he swam toward it until he had reached the side. A voice whispered:
"Is that you, Joe?"
"Yes."
Frank had already gained the boat. He now leaned over the side and grasped Joe's hand, helping his brother on board. Dripping wet, they both crouched in the boat.
"Lucky they didn't see the Sleuth tied down here," whispered Frank. "I've been waiting here for you. I thought sure they had you."
"It was a close call. They mistook us for harbor thieves, eh?"
"Yes."
"Did you see Chet?"
